annotate svr-authpubkey.c @ 1616:5d2d1021ca00

Wait to fail invalid usernames
author Matt Johnston <matt@ucc.asn.au>
date Thu, 23 Aug 2018 23:43:12 +0800
parents 35f38af1238b
children 1fbe598a14fb
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
475
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24 /*
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25 * This file incorporates work covered by the following copyright and
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26 * permission notice:
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27 *
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28 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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29 *
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30 * Redistribution and use in source and binary forms, with or without
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31 * modification, are permitted provided that the following conditions
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32 * are met:
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33 * 1. Redistributions of source code must retain the above copyright
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34 * notice, this list of conditions and the following disclaimer.
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35 * 2. Redistributions in binary form must reproduce the above copyright
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36 * notice, this list of conditions and the following disclaimer in the
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37 * documentation and/or other materials provided with the distribution.
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38 *
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39 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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40 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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42 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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43 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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45 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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46 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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47 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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48 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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49 *
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50 * This copyright and permission notice applies to the code parsing public keys
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51 * options string which can also be found in OpenSSH auth2-pubkey.c file
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52 * (user_key_allowed2). It has been adapted to work with buffers.
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53 *
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54 */
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55
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56 /* Process a pubkey auth request */
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57
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58 #include "includes.h"
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59 #include "session.h"
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60 #include "dbutil.h"
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61 #include "buffer.h"
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62 #include "signkey.h"
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63 #include "auth.h"
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64 #include "ssh.h"
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65 #include "packet.h"
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66 #include "algo.h"
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67
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68 #if DROPBEAR_SVR_PUBKEY_AUTH
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69
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70 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
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71 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
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72
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73 static int checkpubkey(const char* algo, unsigned int algolen,
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74 const unsigned char* keyblob, unsigned int keybloblen);
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75 static int checkpubkeyperms(void);
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76 static void send_msg_userauth_pk_ok(const char* algo, unsigned int algolen,
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77 const unsigned char* keyblob, unsigned int keybloblen);
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78 static int checkfileperm(char * filename);
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79
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80 /* process a pubkey auth request, sending success or failure message as
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81 * appropriate */
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82 void svr_auth_pubkey(int valid_user) {
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83
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84 unsigned char testkey; /* whether we're just checking if a key is usable */
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85 char* algo = NULL; /* pubkey algo */
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86 unsigned int algolen;
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b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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87 unsigned char* keyblob = NULL;
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88 unsigned int keybloblen;
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89 unsigned int sign_payload_length;
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90 buffer * signbuf = NULL;
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91 sign_key * key = NULL;
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92 char* fp = NULL;
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93 enum signkey_type type = -1;
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94
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95 TRACE(("enter pubkeyauth"))
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96
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97 /* 0 indicates user just wants to check if key can be used, 1 is an
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98 * actual attempt*/
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99 testkey = (buf_getbool(ses.payload) == 0);
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100
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101 algo = buf_getstring(ses.payload, &algolen);
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102 keybloblen = buf_getint(ses.payload);
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103 keyblob = buf_getptr(ses.payload, keybloblen);
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104
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105 if (!valid_user) {
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106 /* Return failure once we have read the contents of the packet
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107 required to validate a public key.
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108 Avoids blind user enumeration though it isn't possible to prevent
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109 testing for user existence if the public key is known */
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110 send_msg_userauth_failure(0, 0);
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111 goto out;
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112 }
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113
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114 /* check if the key is valid */
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115 if (checkpubkey(algo, algolen, keyblob, keybloblen) == DROPBEAR_FAILURE) {
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116 send_msg_userauth_failure(0, 0);
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117 goto out;
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118 }
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119
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120 /* let them know that the key is ok to use */
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121 if (testkey) {
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122 send_msg_userauth_pk_ok(algo, algolen, keyblob, keybloblen);
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123 goto out;
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124 }
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125
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126 /* now we can actually verify the signature */
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127
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128 /* get the key */
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129 key = new_sign_key();
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130 type = DROPBEAR_SIGNKEY_ANY;
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131 if (buf_get_pub_key(ses.payload, key, &type) == DROPBEAR_FAILURE) {
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132 send_msg_userauth_failure(0, 1);
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133 goto out;
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134 }
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135
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136 /* create the data which has been signed - this a string containing
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137 * session_id, concatenated with the payload packet up to the signature */
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138 assert(ses.payload_beginning <= ses.payload->pos);
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139 sign_payload_length = ses.payload->pos - ses.payload_beginning;
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parents: 761
diff changeset
140 signbuf = buf_new(ses.payload->pos + 4 + ses.session_id->len);
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
141 buf_putbufstring(signbuf, ses.session_id);
1059
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
142
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
143 /* The entire contents of the payload prior. */
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
144 buf_setpos(ses.payload, ses.payload_beginning);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
145 buf_putbytes(signbuf,
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
146 buf_getptr(ses.payload, sign_payload_length),
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
147 sign_payload_length);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
148 buf_incrpos(ses.payload, sign_payload_length);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload
Matt Johnston <matt@ucc.asn.au>
parents: 853
diff changeset
149
44
45edf30ea0a6 Improved signkey code
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
150 buf_setpos(signbuf, 0);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 /* ... and finally verify the signature */
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
153 fp = sign_key_fingerprint(keyblob, keybloblen);
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
154 if (buf_verify(ses.payload, key, signbuf) == DROPBEAR_SUCCESS) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 dropbear_log(LOG_NOTICE,
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 476
diff changeset
156 "Pubkey auth succeeded for '%s' with key %s from %s",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
157 ses.authstate.pw_name, fp, svr_ses.addrstring);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 send_msg_userauth_success();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 dropbear_log(LOG_WARNING,
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 476
diff changeset
161 "Pubkey auth bad signature for '%s' with key %s from %s",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
162 ses.authstate.pw_name, fp, svr_ses.addrstring);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 m_free(fp);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 /* cleanup stuff */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 if (signbuf) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 buf_free(signbuf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 if (algo) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 m_free(algo);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 if (key) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 sign_key_free(key);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 key = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
179 TRACE(("leave pubkeyauth"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 /* Reply that the key is valid for auth, this is sent when the user sends
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 * a straight copy of their pubkey to test, to avoid having to perform
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 * expensive signing operations with a worthless key */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1422
diff changeset
185 static void send_msg_userauth_pk_ok(const char* algo, unsigned int algolen,
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1422
diff changeset
186 const unsigned char* keyblob, unsigned int keybloblen) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
188 TRACE(("enter send_msg_userauth_pk_ok"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 CHECKCLEARTOWRITE();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_PK_OK);
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1110
diff changeset
192 buf_putstring(ses.writepayload, algo, algolen);
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1110
diff changeset
193 buf_putstring(ses.writepayload, (const char*)keyblob, keybloblen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 encrypt_packet();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
196 TRACE(("leave send_msg_userauth_pk_ok"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1422
diff changeset
200 static int checkpubkey_line(buffer* line, int line_num, const char* filename,
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
201 const char* algo, unsigned int algolen,
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
202 const unsigned char* keyblob, unsigned int keybloblen) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
203 buffer *options_buf = NULL;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
204 unsigned int pos, len;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
205 int ret = DROPBEAR_FAILURE;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
206
1422
4cebe907dfd0 limit input size
Matt Johnston <matt@ucc.asn.au>
parents: 1421
diff changeset
207 if (line->len < MIN_AUTHKEYS_LINE || line->len > MAX_AUTHKEYS_LINE) {
1452
15d4b821bcc9 fix checkpubkey_line function name for TRACE
Matt Johnston <matt@ucc.asn.au>
parents: 1451
diff changeset
208 TRACE(("checkpubkey_line: bad line length %d", line->len))
1422
4cebe907dfd0 limit input size
Matt Johnston <matt@ucc.asn.au>
parents: 1421
diff changeset
209 return DROPBEAR_FAILURE;
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
210 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
211
1421
814f22d4a58f don't exit encountering short lines
Matt Johnston <matt@ucc.asn.au>
parents: 1420
diff changeset
212 /* compare the algorithm. +3 so we have enough bytes to read a space and some base64 characters too. */
814f22d4a58f don't exit encountering short lines
Matt Johnston <matt@ucc.asn.au>
parents: 1420
diff changeset
213 if (line->pos + algolen+3 > line->len) {
814f22d4a58f don't exit encountering short lines
Matt Johnston <matt@ucc.asn.au>
parents: 1420
diff changeset
214 goto out;
814f22d4a58f don't exit encountering short lines
Matt Johnston <matt@ucc.asn.au>
parents: 1420
diff changeset
215 }
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
216 /* check the key type */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
217 if (strncmp((const char *) buf_getptr(line, algolen), algo, algolen) != 0) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
218 int is_comment = 0;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
219 unsigned char *options_start = NULL;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
220 int options_len = 0;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
221 int escape, quoted;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
222
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
223 /* skip over any comments or leading whitespace */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
224 while (line->pos < line->len) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
225 const char c = buf_getbyte(line);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
226 if (c == ' ' || c == '\t') {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
227 continue;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
228 } else if (c == '#') {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
229 is_comment = 1;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
230 break;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
231 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
232 buf_incrpos(line, -1);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
233 break;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
234 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
235 if (is_comment) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
236 /* next line */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
237 goto out;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
238 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
239
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
240 /* remember start of options */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
241 options_start = buf_getptr(line, 1);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
242 quoted = 0;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
243 escape = 0;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
244 options_len = 0;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
245
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
246 /* figure out where the options are */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
247 while (line->pos < line->len) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
248 const char c = buf_getbyte(line);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
249 if (!quoted && (c == ' ' || c == '\t')) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
250 break;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
251 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
252 escape = (!escape && c == '\\');
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
253 if (!escape && c == '"') {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
254 quoted = !quoted;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
255 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
256 options_len++;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
257 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
258 options_buf = buf_new(options_len);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
259 buf_putbytes(options_buf, options_start, options_len);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
260
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
261 /* compare the algorithm. +3 so we have enough bytes to read a space and some base64 characters too. */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
262 if (line->pos + algolen+3 > line->len) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
263 goto out;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
264 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
265 if (strncmp((const char *) buf_getptr(line, algolen), algo, algolen) != 0) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
266 goto out;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
267 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
268 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
269 buf_incrpos(line, algolen);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
270
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
271 /* check for space (' ') character */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
272 if (buf_getbyte(line) != ' ') {
1452
15d4b821bcc9 fix checkpubkey_line function name for TRACE
Matt Johnston <matt@ucc.asn.au>
parents: 1451
diff changeset
273 TRACE(("checkpubkey_line: space character expected, isn't there"))
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
274 goto out;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
275 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
276
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
277 /* truncate the line at the space after the base64 data */
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
278 pos = line->pos;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
279 for (len = 0; line->pos < line->len; len++) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
280 if (buf_getbyte(line) == ' ') break;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
281 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
282 buf_setpos(line, pos);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
283 buf_setlen(line, line->pos + len);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
284
1452
15d4b821bcc9 fix checkpubkey_line function name for TRACE
Matt Johnston <matt@ucc.asn.au>
parents: 1451
diff changeset
285 TRACE(("checkpubkey_line: line pos = %d len = %d", line->pos, line->len))
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
286
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
287 ret = cmp_base64_key(keyblob, keybloblen, (const unsigned char *) algo, algolen, line, NULL);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
288
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
289 if (ret == DROPBEAR_SUCCESS && options_buf) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
290 ret = svr_add_pubkey_options(options_buf, line_num, filename);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
291 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
292
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
293 out:
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
294 if (options_buf) {
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
295 buf_free(options_buf);
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
296 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
297 return ret;
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
298 }
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
299
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
300
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 /* Checks whether a specified publickey (and associated algorithm) is an
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 * acceptable key for authentication */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 /* Returns DROPBEAR_SUCCESS if key is ok for auth, DROPBEAR_FAILURE otherwise */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1422
diff changeset
304 static int checkpubkey(const char* algo, unsigned int algolen,
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1422
diff changeset
305 const unsigned char* keyblob, unsigned int keybloblen) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
306
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 FILE * authfile = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308 char * filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310 buffer * line = NULL;
1420
950c6973f27b split out checkpubkey_line() separately
Matt Johnston <matt@ucc.asn.au>
parents: 1342
diff changeset
311 unsigned int len;
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
312 int line_num;
1330
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
313 uid_t origuid;
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
314 gid_t origgid;
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
315
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
316 TRACE(("enter checkpubkey"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
317
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
318 /* check that we can use the algo */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
319 if (have_algo(algo, algolen, sshhostkey) == DROPBEAR_FAILURE) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
320 dropbear_log(LOG_WARNING,
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 476
diff changeset
321 "Pubkey auth attempt with unknown algo for '%s' from %s",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
322 ses.authstate.pw_name, svr_ses.addrstring);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 /* check file permissions, also whether file exists */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 if (checkpubkeyperms() == DROPBEAR_FAILURE) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
328 TRACE(("bad authorized_keys permissions, or file doesn't exist"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
329 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
330 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
331
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332 /* we don't need to check pw and pw_dir for validity, since
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333 * its been done in checkpubkeyperms. */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
334 len = strlen(ses.authstate.pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
337 filename = m_malloc(len + 22);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
338 snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
339 ses.authstate.pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340
1330
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
341 /* open the file as the authenticating user. */
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
342 origuid = getuid();
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
343 origgid = getgid();
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
344 if ((setegid(ses.authstate.pw_gid)) < 0 ||
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
345 (seteuid(ses.authstate.pw_uid)) < 0) {
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
346 dropbear_exit("Failed to set euid");
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
347 }
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
348
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349 authfile = fopen(filename, "r");
1330
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
350
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
351 if ((seteuid(origuid)) < 0 ||
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
352 (setegid(origgid)) < 0) {
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
353 dropbear_exit("Failed to revert euid");
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
354 }
0d889b068123 switch user when opening authorized_keys
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
355
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 if (authfile == NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
359 TRACE(("checkpubkey: opened authorized_keys OK"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 line = buf_new(MAX_AUTHKEYS_LINE);
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
362 line_num = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 /* iterate through the lines */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 do {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
366 if (buf_getline(line, authfile) == DROPBEAR_FAILURE) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 /* EOF reached */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
368 TRACE(("checkpubkey: authorized_keys EOF reached"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 }
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
371 line_num++;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372
1451
7e95ab97d2b0 fix pubkey authentication return value
Matt Johnston <matt@ucc.asn.au>
parents: 1422
diff changeset
373 ret = checkpubkey_line(line, line_num, filename, algo, algolen, keyblob, keybloblen);
7e95ab97d2b0 fix pubkey authentication return value
Matt Johnston <matt@ucc.asn.au>
parents: 1422
diff changeset
374 if (ret == DROPBEAR_SUCCESS) {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
375 break;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
378 /* We continue to the next line otherwise */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 } while (1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 if (authfile) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 fclose(authfile);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 if (line) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 buf_free(line);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 m_free(filename);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
390 TRACE(("leave checkpubkey: ret=%d", ret))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391 return ret;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 /* Returns DROPBEAR_SUCCESS if file permissions for pubkeys are ok,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 * DROPBEAR_FAILURE otherwise.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 * Checks that the user's homedir, ~/.ssh, and
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 * ~/.ssh/authorized_keys are all owned by either root or the user, and are
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 * g-w, o-w */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 static int checkpubkeyperms() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 char* filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 unsigned int len;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
406 TRACE(("enter checkpubkeyperms"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
408 if (ses.authstate.pw_dir == NULL) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
412 if ((len = strlen(ses.authstate.pw_dir)) == 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 filename = m_malloc(len + 22);
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
419 strncpy(filename, ses.authstate.pw_dir, len+1);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 /* check ~ */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 /* check ~/.ssh */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427 strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
428 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
431
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
432 /* now check ~/.ssh/authorized_keys */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
433 strncat(filename, "/authorized_keys", 16);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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435 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
437
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 /* file looks ok, return success */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441 out:
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 m_free(filename);
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parents:
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443
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
444 TRACE(("leave checkpubkeyperms"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
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445 return ret;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 /* Checks that a file is owned by the user or root, and isn't writable by
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 * group or other */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451 static int checkfileperm(char * filename) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 struct stat filestat;
248
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
453 int badperm = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
455 TRACE(("enter checkfileperm(%s)", filename))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 if (stat(filename, &filestat) != 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
458 TRACE(("leave checkfileperm: stat() != 0"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459 return DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461 /* check ownership - user or root only*/
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
462 if (filestat.st_uid != ses.authstate.pw_uid
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
463 && filestat.st_uid != 0) {
248
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
464 badperm = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
465 TRACE(("wrong ownership"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
466 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
467 /* check permissions - don't want group or others +w */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
468 if (filestat.st_mode & (S_IWGRP | S_IWOTH)) {
248
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
469 badperm = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
470 TRACE(("wrong perms"))
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
471 }
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
472 if (badperm) {
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
473 if (!ses.authstate.perm_warn) {
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
474 ses.authstate.perm_warn = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
475 dropbear_log(LOG_INFO, "%s must be owned by user or root, and not writable by others", filename);
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
476 }
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
477 TRACE(("leave checkfileperm: failure perms/owner"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
478 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
479 }
248
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
480
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
481 TRACE(("leave checkfileperm: success"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
482 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
483 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
484
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
485 #endif